Fe~(3+)对石墨烯氧化物荧光淬灭机理的研究

采用改进的Humer法合成了石墨烯氧化物,利用搭建的时间分辨光谱探测系统详细探究了Fe~(3+)(浓度为0.5、1、2 mmol/L)对石墨烯氧化物荧光淬灭物理机制。稳态荧光发射光谱中,随着Fe~(3+)浓度的增加,石墨烯氧化物的荧光强度急剧减弱。时间分辨荧光光谱和飞秒瞬态吸收光谱研究证实,加入不同浓度Fe~(3+)的GO其动力学衰减曲线基本没有任何变化。结果表明,Fe~(3+)对石墨烯氧化物的荧光淬灭主要是静态的荧光淬灭过程。

Fluorescence quenching mechanism of graphene oxide by Fe3+

The graphene oxide(GO) is synthesized by the improved Hummer method. The fluorescence quenching mechanism of graphene oxide by Fe³⁺(0.5, 1, 2mmol/L) in detail is studied using the time-resolved spectrometry probe system. From the steady photoluminescence emitting spectra, the fluorescence intensity of GO decreased dramatically as the Fe³⁺ concentration increased. From the time-resolved fluorescence spectra and femtosecond transient absorption spectra, the dynamic decay curves have no extinctive changes for GO with different Fe³⁺ concentrations. It is proved that the fluorescence quenching mechanism of GO by Fe³⁺ is mainly ascribed to the static fluorescence quenching.